<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .active{
            color:red;
        }
        .line{
            color:rgb(0, 255, 200);
        }
    </style>
</head>
<body>
    <div id="app">
        <h2 class="active">{{message}}</h2>
        <h2 :class="active">{{message}}</h2>
        <h2 v-bind:class="{active:isActive,line:isLine}">{{message}}</h2>
        <button v-on:click="btnClick">变色</button>
    </div>
    <script src="../js/vue.js">
    </script>
    <script>
        const app=new Vue({
            el:'#app',
            data:{
                message:'你好啊',
                imgUrl:'https://img.guguzhu.com/d/file/android/2021/06/11/yf24lgms0dg.png',
                isActive: true,
                isLine: true,
            },
            //方法
            methods:{
                btnClick:function(){
                    this.isLine=!this.isLine
                }
            }
        })
    </script>
</body>
</html>